// JavaScript Document
function switchImage(ImgName, ImgSrc) 
{
  if (document.images)
  {
	    document.images[ImgName].src=ImgSrc;
  }
}
<!-- behajici kolecka-->
  var let1 = 0;
  var let2 = "";
  
  function upd_wait_text() {
     var let3 = document.getElementById('myt');     
     let1 = let1 + 1;
     
     if (let1 == 15) {
       let2 = ""; 
       let1 = 0; 
     }
		
     let2 = let2 + "&deg;";  
     let3.innerHTML = '<span class="waitsymbol">' + let2 + '</span>';
     setTimeout("upd_wait_text()", 300)
  }